249 citations · 854 across the 13 of their papers we have counts for
13 papers
Quantum critical dynamics in a 5000-qubit programmable spin glass
Andrew D. King, Jack Raymond, Trevor Lanting +24
Experiments on disordered alloys suggest that spin glasses can be brought into low-energy states faster by annealing quantum fluctuations than by conventional thermal annealing. Du…
Coherent quantum annealing in a programmable 2000-qubit Ising chain
Andrew D. King, Sei Suzuki, Jack Raymond +21
Quantum simulation has emerged as a valuable arena for demonstrating and understanding the capabilities of near-term quantum computers. Quantum annealing has been used successfully…
Diversity metric for evaluation of quantum annealing
Alex Zucca, Hossein Sadeghi, Masoud Mohseni +1
Solving discrete NP-hard problems is an important part of scientific discoveries and operations research as well as many commercial applications. A commonly used metric to compare…
Imprints of cosmological tensions in reconstructed gravity
Levon Pogosian, Marco Raveri, Kazuya Koyama +6
There has been a significant interest in modifications of the standard Cold Dark Matter (CDM) cosmological model prompted by tensions between certain datasets, most notably…
Improving nonstoquastic quantum annealing with spin-reversal transformations
Eleni Marina Lykiardopoulou, Alex Zucca, Sam A. Scivier +1
Nonstoquastic Hamiltonians are hard to simulate due to the sign problem in quantum Monte Carlo simulation. It is however unclear whether nonstoquasticity can lead to advantage in q…
Generalized Brans-Dicke theories in light of evolving dark energy
Alex Zucca, Levon Pogosian, Alessandra Silvestri +2
The expansion history of the Universe reconstructed from a combination of recent data indicates a preference for a changing Dark Energy (DE) density. Moreover, the DE density appea…
MGCAMB with massive neutrinos and dynamical dark energy
Alex Zucca, Levon Pogosian, Alessandra Silvestri +1
We present a major upgrade of MGCAMB, a patch for the Einstein-Boltzmann solver CAMB used for phenomenological tests of general relativity against cosmological datasets. This new v…
Observational Constraints on Constant Roll Inflation
Jose T. Galvez Ghersi, Alex Zucca, Andrei V. Frolov
Constant-roll inflation was recently introduced by Motohashi, Starobinsky and Yokoyama as a phenomenological way to parametrize deviations from the slow-roll scenarios. In this pap…
Evolution of dark energy reconstructed from the latest observations
Yuting Wang, Levon Pogosian, Gong-Bo Zhao +1
We reconstruct evolution of the dark energy (DE) density using a nonparametric Bayesian approach from a combination of latest observational data. We caution against parameterizing…
Searching for Primordial Magnetic Fields with CMB B-modes
Levon Pogosian, Alex Zucca
Was the primordial universe magnetized? The answer to this question would help explain the origin of micro-Gauss strength magnetic fields observed in galaxies. It is also of fundam…
Unscreening scalarons with a black hole
Andrei V. Frolov, José T. Gálvez Ghersi, Alex Zucca
It is typically believed that the additional degrees of freedom in any modification of gravity are completely suppressed by the large energy densities coexisting with an astrophysi…
Constraints on Primordial Magnetic Fields from Planck combined with the South Pole Telescope CMB B-mode polarization measurements
Alex Zucca, Yun Li, Levon Pogosian
A primordial magnetic field (PMF) present before recombination can leave specific signatures on the cosmic microwave background (CMB) fluctuations. Of particular importance is its…
Searching for scalar gravitational interactions in current and future cosmological data
Alireza Hojjati, Aaron Plahn, Alex Zucca +4
Modified gravity theories often contain a scalar field of gravitational strength which interacts with matter. We examine constraints on the range and the coupling strength of a sca…